Machine for bending steel profiles and rods



De- 16, 1952 w. PEDDINGHAUS TAL 2,621,702

MACHINE FOR BENDING STEEL PROFILES AND RODS Filed March 23, 1950 rg 21 D x '1 ze,l y-

munl lllllllllll d INVENTORS: WER/vela PEoD/n/c-.Hnus

. am. FUN/4E,

BY Mm Patented Dec. 16,', 1952 MACHINE FOR BENDING STEEL PROFILES AND RODS v Werner Peddinghaus and Emil Funke, Gevelsberg,

Westphalia, Germany, assignors to Paul Ferd. Peddinghaus, Gevelsberg, Westphalia, Germany Application March 23, 1950, Serial No. 151,362 In Germany October 10, 1949 1 claim. 1

steel proles and rods and particularly steel rods which are used to reinforce concrete structures.

Machines of Ithis type generally comprise a bending disc which supports the steel proles or rods during the bending process; this disc is usually mounted on a table or plate or a similar supporting structure and the disc rotating means are located underneath the table. 'Ihe bending disc and its driving gear are generally carried by a shaft and they are located above and underneath the table plate. The one-sided support of the bending disc at the underside of the table plate does not afford suicient resistance to the strong bending forces and stresses. The bearing which supports the bending disc is loosened after `a comparatively short period of operation; this reflects on the drive mechanism which becomes unt to transmit the great forces which are needed for the bending work; early :breakage of the bending equipment is a natural consequence.

Attempts have been made to eliminate this disadvantage by the provision of a bottom plate and the installation of a counter-bearing on this bottom plate. However, this counter-:bearing did not properly serve this purpose, because of the great distance between the bending disc and the bottom plate; it particularly did not eliminate the twisting and the distortion of the driving means in spite of the use of a strong machine housing.

It is the main object of this invention to remedy this failure and to provide a bearing structure for steel rod bending machines and particularly for the discs supporting these rods which combine suiiicient resistance to the stresses occurring during the bending work with structural simplicity.

It is also an object of the invention to design a bearing structure for the steel rod supporting disc, which is provided with a double support located in proximity to the disc and adapted to reliably take-up the bending forces.

In compliance with these objects the hitherto customary one-sided support of the bending disc is replaced by a two-sidedly supported bearing unit for the disk and its driving means; this bearing structure is located at the very place where the bending stressesV are generated and transmitted to the disc driving means such as a gear wheel which rotates the bending disc and its accessory driving members. The hitherto customary table plate which supports the bending disc and the articles carried thereon is thus replaced by a double-plate bearing structure;

this is achieved by the attachment to the underside of the table plate of a U-shaped branchedoff bridge member; the thus produced doubleplate bearing unit houses the gear wheel which rotates the bending disc and it supports the steel and the disc on both sides. The bending stresses are directly taken-up by this two-sided support at .the place Where they are created and damaging eiects upon the driving wheel and its accessory drive members are eliminated. Y l

The support of the drive members by this double-plate bearing unit renders the y greater part of the underside of the table plate usable for the location of the accessory driving members including the drive motor.

In this manner an efficient manner of mounting these parts has been provided and themachine supporting structure may be constructed as a. closed housing protecting the driving parts against dust and damaging atmospheric conditions.

The above recited manner of mounting the machine driving and operating parts, which may be operated with higher lforce inputs without an increase of the manufacturing costs greatly increases the applicability of themachine and the same may therefore be equally well used -for the bending of rods having a great and a small diameter. It is understood that means will have to be installed to adapt the speed ofthe machine to a change of vtheworking conditions; .for this purpose a gradually changeable drive is provided, which will be described more in detail as this specification proceeds.

The invention is illustrated by way of example in the attached drawings in which Fig. 1 is a side view of the machine, the machine housing being indicated by dash and dotted lines,

Fig. 2 is a side View taken at an angle of 90 relative to Fig. 1,

Fig. 3 is a top View of the machine and Fig. 4 is a part sectional View of a gradually variable machine drive.

The machine for bending steel profiles and rods shown in the drawing comprises a table provided with a plate l. A disc 4 which carries the articles I6 to be bent is located on top of this table plate. Gear wheel 3 which rotates disc 4 is situated underneath the table plate I and mounted in a double-plate bearing unit formed of the table plate and the U-shaped frame member 2 :branched-01T from this table plate.

The shaft 25, upon which gear 3 and disc 4 are mounted, is located between and supported at two places by plate I and bridge 2.

Due to this double support of the drive wheel 3 and the bending disc 4 the bending stresses are taken-up by bearing unit I, 2 at the very place where they are created and in this manner a satisfactory resistance is achieved of the driving elements to the bending stresses.

The pinion 5 meshes with gear 3; the pinion shaft 6 is also carried by bearing unit I, 2. This shaft carries at its lower end a bevel gear 'I which meshes with pinion 8 located on a shaft 9; this shaft is supported by bearings I9, II which are also fastened to unit I, 2. A disc-wheel I2 .is located on the one end of shaft 9; the wheel is drivingly connected through belt I3 with the driving disc of the motor I4; the latter is also carried by bearing unit I, 2.

Disc 4 carries a center roller I5; the steel rod I6 is bent about this roller I5 by the rotating bending roller I7. A roller I8 located on the table plate I serves as a countersupport.

The unit I, 2 may be made by casting or welding. The machine housing should be covered with sheets to protect the drive mechanisms.

The described structure of the machine permits a greatly enlarged eld of application; this, however, necessitates an easy change of the number of revolutions of the bending disc. For this purpose, a step-free gradually changeable drive mechanism is provided. The motor I4 is displaceably or swingably connected with the bearing unit I, 2; a driving disc having a varia`- ble diameter is mounted on the motor stump I9; the disc consists in the usual manner of conical disc members 20, 2I of which disc 2l is displaceable on shaft I9. Disk member 20 is mounted on a cap 23 solidly connected with shaft I9; disc 2l is axially displaceable on the cap against spring 24.

If the motor I4 is swung towards disc-wheel I2 the tension of the belt is reduced and the belt slides due to the centrifugal action and the wedge impulse exerted by disc member 2l under the influence of spring 24 towards the outer diameter of the discs 20, ZI. As a consequence thereof the number of revolutions is increased. If, however, the motor is moved in the opposite direction and away from disc I2 the tension of the belt I3 increases and presses the movable disc 2| back against the pressure of the spring 24 until an equilibrium state is reached between these two tensional forces; accordingly the number of revolutions is reduced. The lateral movement of the belt I3 is enabled by an accordingly broad configuration of the belt carrying disc I2.

By the interposition of the spring 24 between the discs 20, 2| the building length for the two discs is reduced to such an extent that they can be easily placed on the normal short stump of the motor.

The invention has been described with reference to a preferred embodiment and it will be understood that many variations and modications thereof may be resorted to without departure from the scope of the invention as dened in the following claim.

We claim:

In a strip bending machine, an upper plate to receive the strip to be bent, a U-shaped support branched-off from the underside of said plate and forming therewith a rectangularly shaped double-plate bearing bridge of a substantially uniform cross-section, a closed movable boxshaped support for said ybearing bridge, a gear drive comprising a driving gear wheel and a driven gear wheel in mesh therewith, said gear wheels being .disposed vbetween the plates of said bridge, two shafts mounted with their opposite ends in the lower and the upper plate and each supporting a gear wheel, the shaft of said driven gear wheel being rotatable therewith and extending upwardly beyond the upper face of said bridge, a bending disc mounted upon the upper end of said last named shaft, a center roller and an eccentric bending roller located upon said -disc and a stationary roller on said upper plate, said rollers cooperating for a mutual bending coaction.

WERNER PEDDINGHAUS, EMIL FUNKE.

REFERENCES CITED The following references are of record in the le 0f this patent:

UNITED STATES PATENTS Myers Oct. 27, 1942 

